Which of the following is the most characteristic feature of the electronic configurations of the elements in a vertical column?
A) The electron configurations are identical.
B) The valence electrons are of the same type and number.
C) The valence electrons are always paired.
D) The valence electrons are never paired.

Question

Quizplus · Accepted Answer

The most characteristic feature of the electronic configurations of the elements in a vertical column is that the valence electrons are of the same type and number. This is because elements within the same group have the same number of valence electrons, which determines their chemical properties and reactivity. However, the inner shell electrons may differ in number, leading to different total electron configurations.

Which of the Following Is the Most Characteristic Feature of the Electronic